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-rw-r--r--test/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/test/Makefile b/test/Makefile
index 82422b551d7c..e02daa072546 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -22,6 +22,10 @@ include Makefile.tests
# DejaGNU testing support
#===------------------------------------------------------------------------===#
+ifneq ($(GREP_OPTIONS),)
+$(warning GREP_OPTIONS environment variable may interfere with test results)
+endif
+
ifdef VERBOSE
RUNTESTFLAGS := $(VERBOSE)
endif